I think the Ultramarines are misunderstood - Ultramar is probably the most socially advanced and well Governed region of the Imperium. Yes, they love to follow the rules, so i suppose if that's what your on about I'd agree, but compared to some of the other Legions/Chapters/Primarchs they are the most decent - many of the others, even Loyalists, are complete twonks.
I don't think the Emperor is boring though - daft as a brush sometimes, but not boring. He missed a trick not allowing people to worship him and not making people aware of Chaos, so when it reared it's head everyone was unprepared for it and didn't know what to look out for. Had he simply allowed Lorgar to worship him and told people of the actual truth, not the "imperial truth", the Heresy wouldn't have happened... And that's just two of his many balls-ups.